Muffler for internal combustion engines



R m R m N. E N\ S Q m m ll l ATTORNEY Oct. 8,, 1935. s. s. HANSON MUFFLER FOR INTERNAL COMBUSTION ENGINES Filed Dec. 2, 1953 Patented Oct. 8, 1935 PATENT OFFICE MUFFLER FOR INTERNAL COMBUSTION ENGINES Soren S. Hanson, Brooklyn, N. Y., assignor of forty per cent to William Olson, Brooklyn,

Application December 2, 1933, Serial No. 700,647

3 Claims.

This invention is an improvement upon the device of my Patent No. 1,946,908 of February 13, 1934, and its object is to accelerate the movement of the exhaust gases through the muffler and still further reduce back pressure.

In my improved device the gases after being discharged upon a deflecting conical member and caused to move toward the periphery of said member in a generally spiral path, are caused to split up into two streams, one underlying the other, and each stream being caused to ascribe a spiral path reverse to that of which they are directed by the initial conical member and the gases being successively baffled in their movement to the discharge end of the device. By splitting the gases up into two relatively thin layers by members integrally carrying bafiiing devices, and by the general construction of my muffler, quicker cooling action is eflected upon the hot vapors and their successive degrees of contraction produce what may be termed a vacuum effect at the discharge end of the device so that back pressure is materially reduced.

The invention will be described with reference to the accompanying drawing, in which Fig. 1 is a longitudinal section of an apparatus embodying the invention.

Fig. 2 is a View in elevation of the elements separated and partly broken away to better show their construction and relationship.

Fig. 3 is a plan view of the device at its inlet end, the casing being partly broken away to expose the initial deflecting cone.

Fig. 4 is a fragmentary plan view of the primary deflector.

Referring to the drawing, l indicates the inlet of the muffler, 2 the inlet casing, 3 the outlet casing, and 4 the outlet of the muffler.

The outer body of the muffler comprises the conical casing members 2 and 3, these members being apertured to receive bolts 5 by means of which the casing members are held together and in turn rigidly locking in position, the other members of the assembly disposed within the casing.

Located within the body of the muffler is the reception cone 6, the apex being directed toward the incoming gases. Reception cone 6 at its margin is provided with spirally arranged channels indicated at 6x, the top walls of the channels abutting that end of casing member 2 adjacent bolts 5 and clearances 65cm, Fig. 3, may be formed in the reception cone to: permit the passage of the bolts. 1

The inner wall of reception cone 6 may be formed with an annular rib or spaced abutments I which receive the peripheral wall of secondary deflecting member 8. Secondary deflecting member 8 abuts the walls of spirally arranged channels 9r of primary deflecting member 9 and 5 the walls of spirally arranged channels it on the opposite face of member 9 directly abut the inner wall of casing member 3. The periphery of member 9 is scalloped, as shown more particularly at 9mm, Fig. 2, and within the periphery of 10 member 9 are annular flanges ll, H02, directed toward reception cone 6 and provided with gas passageways disposed at an angle relative to the radii of said member 9. When the members are assembled, reception cone 6 carries intermediate 15 flanges l I, l lzc, and an annular flange-like baffle l2 which is scalloped to afford passageways for the gas.

On the face of member 9, opposite flanges H, Ilar, is formed a baflle flange 13 provided with a 20 scalloped edge to afford passageways for the gases. Flange I3 is spaced from a baiiie flange 3a: carried by easing member 3. Flange 3.1: at its periphery is scalloped or otherwise provided with spaced channels for the passage of the gases to the outlet 4.

In the operation of the device, the exhaust gases enter the inlet l and strike the reception cone 6. The gases are spread until they assume a relatively thin layer adjacent channels 60: and pass through the channels to the periphery of the reception cone which is held spaced from casing member 2 by means of projections a. The gases thus are enabled to move toward the scalloped periphery 99cm of member 9 and two layers of the gases are formed, one entering the passageways of baffle flange I la: and one passing through the passageways of member 9am: to a point below the same. The first layer strikes baffle flange Hr and passes through its apertures. It then strikes baflie flange l2 and passes through its apertures following which the layer strikes bafiie flange II and passes through the apertures thereof and is directed upwardly and is given a spiral movement through channels 93: of member 9, thence is sharply deflected through the discharge end of primary deflector 9, the walls of members 8 and 9 absorbing heat from the gases as the layer traverses the said path.

The second layer of the gases, passing downwardly through the scalloped peripheral member 92cm of member 9 meet the channels If) and are directed in a spiral path inwardly, the gases meeting baffle flange l3 and passing through its apertures, and then striking bafiie flange 3a: and

passing through the apertures thereof, and thence being directed to the outlet 4, mixing with the gases of the initial layer.

At the annular contact area between reception cone 6 and secondary deflecting member 8, there may be formed spiral gas flow passages such as indicated diagrammatically at [4, Fig. 2, so that the layer of gases entering the space between the reception cone and the primary deflecting member may be split into two sections, one of which flows through the channels 14 into the area between the reception cone 6 and deflecting member 8 and emerges from the axial aperture of the latter.

It will be understood that the embodiment of the invention illustrated in the drawing is illustrative and that modifications may be made therein without departing from the spirit of the invention. What I claim and desire to secure by Letters Patent, being as follows:

1. A mufiler comprising opposed connected casing members, one being a substantially frustoconical inlet member having an axial inlet, and the second being an outlet member having an axial outlet, a reception cone within the casing and having its apex directed toward the inlet and so mounted as to permit the flow of gases from its apex past its periphery, a primary deflecting member disposed in the casing below said reception cone and having a frusto-conical central section formed with an axial outlet, a secondary deflecting member disposed intermediate the reception cone and said primary deflecting member and having a frusto-conical central section formed with an axial outlet, baffle flanges carried by the primary deflecting member near the periphery thereof and permitting the flow of gases in a plurality of layers, one layer between the reception cone and the primary deflecting member, and one layer intermediate the primary deflecting member and the casing outlet memher.

2. A muffler comprising opposed connected inlet and outlet casing members, a hollow reception cone within the casing, having its apex directed toward the inlet casing member and passageways being provided at its periphery to permit the flow of gases at such point toward the outlet casing member, a deflecting member having a peripheral area within the hollow reception cone and abutting its inner wall, shallow passageways being provided at said abutment for the flow of gases into the cone, the deflecting member having a discharge opening directed toward the outlet casing member, and a second deflecting member intermediate the first-named deflecting member and the outlet casing member and having a discharge opening, shallow passageways being provided between the two deflecting members and also between the peripheral area of the second deflecting member and the adjacent wall of the muflier, whereby gases flowing into the muffler are directed by the reception cone outwardly to the periphery thereof, the gases then being divided into a plurality of streams including streams entering the reception cone and passing therefrom through the discharge opening of the first-named deflecting member to meet streams passing intermediate the deflecting members.

3. A muffler comprising opposed connected inlet and outlet casing members, a hollow reception cone within the casing, having its apex directed toward the inlet casing member and passage ways being provided at its periphery to permit the flow of gases at such point toward the outlet casing member, a deflecting member having a peripheral area within the hollow reception cone and disposed adjacent its inner wall and adapted for the flow of gases at said peripheral area into the cone, the deflecting member having a discharge opening directed toward the outlet casing member, and a second deflecting member intermediate the flrst-named deflecting member and the outlet casing member and having a discharge opening, shallow passageways being provided between the two deflecting members and also between the peripheral area of the second deflecting member and the adjacent wall of the muffler, whereby gases flowing into the mufller are directed by the reception cone outwardly to the periphery thereof, the gases then being divided into a plurality of streams, gases entering the reception cone and passing therefrom through the discharge opening of the first-named deflecting member to meet gases passing intermediate the deflecting members.

SOREN S. HANSON. 

